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Chinese Journal of Materials Research  2021, Vol. 35 Issue (5): 349-356    DOI: 10.11901/1005.3093.2020.380
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Super Low Friction Characteristics Initiated by Running-in Process in Water-based Lubricant for Ti-Alloy
ZHANG Huichen(), QI Xuelian
Naval Architecture and Ocean Engineering College, Dalian Maritime University, Dalian 116026, China
Cite this article: 

ZHANG Huichen, QI Xuelian. Super Low Friction Characteristics Initiated by Running-in Process in Water-based Lubricant for Ti-Alloy. Chinese Journal of Materials Research, 2021, 35(5): 349-356.

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Abstract  

The influence of running-in process on friction characteristics of Ti-alloy by water-based lubrication process were investigated via CETR universal micro-tribometer (UMT-2) with Ti6Al4V disc and Si3N4 ball as tribo-pairs, konjac glucomannan (KGM) solutions as lubricant. The differences of the lubricating properties for Ti-alloy after dry friction and boric acid running-in process were analyzed. The results show that the wear area on the Si3N4 ball generated in the running-in process is the key factor that influenced the achieving of super-low friction. The super-low friction state (friction coefficient less than 0.01) could be acquired with KGM solution after both boric acid running-in and dry running-in. In the case of dry friction running-in, the super-low friction coefficient can be acquired only for the case with higher concentration KGM solutions and higher running speed, which mainly rely on the stronger hydrodynamic effect. In the case of boric acid running-in, the surface roughness of the tribo-pairs were greatly reduced, and the hydration layer of KGM was promoted by the chemical reactions between the boric acid and the KGM molecules. The super-low friction state could be achieved by the repulsive force between the hydrated KGM layers even for the solutions with low concentration of KGM.

Key words:  surface and interface in the materials      super-low friction      running-in process      water-based lubrication      titanium alloy     
Received:  08 September 2020     
ZTFLH:  TG142.1  
Fund: National Natural Science Foundation of China(51775077)
About author:  ZHANG Huichen, Tel: 15542672593, E-mail: hczhang@dlmu.edu.cn

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2020.380     OR     https://www.cjmr.org/EN/Y2021/V35/I5/349

Fig.1  Molecular Structure of konjac glucomannan
Fig.2  Friction curve with 0.5% KGM solution lubrication in dry friction running-in
Fig.3  Wear area on the Si3N4 ball after dry friction running-in
Fig.4  Friction curve after changing new Si3N4 ball
Fig.5  Friction coefficient under different concentrations and corresponding film thickness
Fig.6  Friction curve with 0.1% KGM solution lubrication
Mass fraction/%0.10.20.30.40.50.60.70.80.91.0
Viscosity/mm2·s-126.0664.35115.63200.31420.58713.251026.481415.972056.562837.17
Table 1  Viscosities of KGM solution with different concentrations
Fig.7  Variation of friction coefficient with rotational speed in different KGM concentration solution lubrication
Fig.8  Surface topography of Ti6Al4V (a) 0.1%; (b) 0.5%; (c) 0.9%
Fig.9  Friction curves in different running-in process with 0.1% KGM solution lubrication (a) boric acid running; (b) dry running
Fig.10  Variation of friction coefficient with concentrations in two kinds of running-in process
Fig.11  Surface topography of Si3N4 ball after different running-in process (a) dry friction running-in; (b) boric acid running-in
Fig.12  SEM image and EDS analysis of Ti6Al4V specimens after different running-in process (a) dry friction running-in; (b) boric acid running-in
Fig.13  Raman spectrum of the KGM solution and KGM-boric acid mix solution
Fig.14  Illustration for lubrication model under different surface roughness (a) lower roughness; (b) larger roughness
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